Re [Premium-Rx] Lightning hitting your Premium RX

[w3jn]

Absolutely.  No way a teensey little PW bulb is gonna sink a direct 
lightning strike.

73 John

----- Original Message ----- 
From: "Cecil Acuff" <chacuff at cableone.net>
To: "Edward Knobloch" <ed.knobloch at verizon.net>; <premium-rx at ml.skirrow.org>
Sent: Friday, April 08, 2005 1:28 PM
Subject: Re: Re [Premium-Rx] Lightning hitting your Premium RX


> Hey Folks,
>
>        Keep in mind that the NE-2 is only effective for static charge 
> reduction.  It will provide little protection for lightning strikes...even 
> nearby strikes.  Most protection devices that are effective today are 
> using a gas tube of some sort that is designed to ionize and take massive 
> amounts of instantaneous current to ground.  Some are also designed to be 
> fast enough to provide some protection against EMP damage.  I am familiar 
> with the Polyphaser products that provide that protection.  They do have a 
> limited life span and need to be tested (if you have the means) or 
> replaced routinely.  After a few good strikes they go out of spec. and 
> don't clamp at the design voltages allowing unnecessary damage to occur. 
> They require a low impedance, high current path to your system ground to 
> work properly. Cost around $70-$80 each.  They can be tested with a Hypot 
> tester.
>
> Good investment...
>
> Cecil Acuff
>
>
> ----- Original Message ----- 
> From: "Edward Knobloch" <ed.knobloch at verizon.net>
> To: <premium-rx at ml.skirrow.org>
> Sent: Friday, April 08, 2005 10:37 AM
> Subject: Re [Premium-Rx] Lightning hitting your Premium RX
>
>
>> Hi, Gang
>>
>> I second the idea of a neon bulb across the antenna input,
>> popular since at least the 1950's among hams.
>>
>> Beware of the current Radio Shack "NE-2", though.  They package a NE-2 
>> bulb with a series resistor
>> (something like 47K) for 110V operation, and still call that combination 
>> an "NE-2".  For receiver protection
>> you want a bare Ne-2 bulb without the series resistor.
>>
>> Among some mil surplus electronics stuff I bought as a lot on eBay,
>> came two "transient eliminators," small diecast boxes with BNC 
>> connectors.
>> They were labeled "LEA Dynatech, Santa Fe Springs, CA
>> TE(HF) 75-BIP 12".  I leave one installed on my Racal 6790,
>> and have not had a repeat of the failure of the first mixer card,
>> which happened twice in my first year of ownership.
>> I don't know what magic device is inside the diecast box -
>> perhaps an NE-2?
>>
>> 73,
>> Ed Knobloch
>>
>>
>> w3jn at direcway.com wrote:
>>
>>>A neon bulb across the input works FB for draining off static charges.  A 
>>>NE-2 fires at about 60 volts, IIRC.
>>>
>>>Don't try this if you're gonna xmit thru it - you'll wreck the bulb.
>>>
>>>73 John
>>>
>>
>>
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>
>
>
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